As i commented in this post PLEASE ! - Don't remove Raytracing Reflection (Deprecated) in 5.4 - #15 by RenyV
the combination of these 2 variables makes reflections a lot better when roughness is 0
r.Lumen.Reflections.DownsampleFactor 0
r.Lumen.Reflections.Temporal 0
but that it introduces a lot of noise if roughness isn’t 0. for those
r.Lumen.Reflections.Temporal has to be set to 1 to look better
so, it’s a trade off if you have different roughness in the scene. at least for realtime and interactive solutions.
renders can be improved with more samples and a good post denoiser
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